Harrop Breather Kit | Diff & TransDesigned and engineered in Australia the Harrop Differential & Transmission Breather Kit has been designed to replace the factory breathers on your vehicle, and keep it breathing clean in the harshest environments. It is a 4 port, fully sealed system that breathes back into the induction system, a design that helps to prevent water, mud and other contaminants from getting into your differentials, gearbox and transfer cases as well as eliminating the